Grinding device



Feb. 22, 1938.

J. HRIBAR GRINDING DEVICE Filed July 20, 1936 2 Sheets-Sheell 2'Patented Feb. 22, 193s 2,109,292 i UNITED STATES PATENT OFFICE GRINDINGDEVICE Joseph Hribar, Lockport, lill.

Application July 20, 1936, Serial No. 91,611

14 Claims. (Cl. 51-241) This invention relates particularly to agrindmicrometer adjustment for the inner frame C, ing device which maybe usefully employed in enabling the grinding element D to be nicelygrinding the connecting-rod bearings of aadjusted with relation to thebearing-portion B crank-shaft, for example. .of the crank-shaft.

'Ihe primary object is to provide a device of The main frame A of thedevice preferably is '5 this character which may be used to grind theconstructed of a plurality of members which connecting-rod bearingswithout the necessity may be taken apart at will. In the illustration ofremoving the crank-shaft from the main given, the frame comprises anangular basebearings of the engine. portion I which aiTords anend-member la and 'Ihe invention is illustrated in a preferred emalongitudinal member lb, the tubular handle E l0 bodiment in theaccompanying drawings, in being -xedly mounted in the end-member I a;whichv a side-member 2 having its lower portion secured Fig. 1 is anedge elevational view of a desirable by cap-screws 2a to the member lb;and a sideembodiment oi the invention; Fig. 2, a -view at member 3having its lower end secured by capright angles to the View shown inFig. 1, illusscrews 3a to the end-member la. The upper endl5 trating thegrinding device in positi i for grindportions of the side-members 2 and3 are curved ing a crank-bearing of a crank-shaft, the handle towardseach other, as indicated at 2b and 3h of the device being shownbrokenly; Fig. 3, a respectively. The ends of the members overlaplongitudinal sectional View of the improved deand are interlockinglyconnected, as by means vice; Fig. 4, an enlarged broken sectional viewof a. hook and groove connection indicated at 4 20 taken as indicated atline 4 of Fig. 3; and Fig. 5, and a pin and hole connection as indicatedat 5. an enlarged sectional view taken as indicated at When the screwsi!a are removed, the member 3 line 5 of Fig. 3. f may be swung outwardlyand upwardly and then It may be stated preliminarily that the imliftedaway from the upper end of the member 2,

proved grinding device is adapted to be susthe interlock connections at4 and 5 permitting 25 pended from a crank of' the crank-shaft after thisaction. the crank has been disconnected from the con- The inner surfaceof the upper end-portion of necting-rod joining it to thepiston of theengine; the member 2 is equipped with a bearing-block E also, that thegrinding device preferably employs which is secured in position by'screws 6b. The

a belt-like grinding element which preferably is inner surface of theside-member 2 is provided 30 operated by an electric motor, the grindingbeing with a guide 'l in which is adjustably mounted effected while theengine-motor turns slowly. It a bearing-member la. The member 'la issewill be understood that in operation the upper cured to the sidemember 2 by means of a headend of the implement follows the movements ofscrew 'lb which may be adjusted in a slot 8 with the crank-shaft whilethe operator of the grindwhich the member 2 is provided. Y 35 ing devicesteadies and guides the lower end of Similarly, the side-member 3 isequipped at its the implement by means of the handle with' inner sidewith a guide 9 in which is mounted a which it is equipped.bearing-member 9a secured by means of a screw In the embodimentillustrated, A designates a, 9b which can be adjusted in a slot I0 withwhich 40 main frame which is adapted to `be suspended the side member 3is provided. 40

from a crank-portion B of a, crank-shaft; C, an The bearing la may beadjusted towards the inner frame which is longitudinally adjustablecrank-shaft by means of an adjusting screw II and which is equipped atits lower end with a which has threaded connection with a lug Ilarigidly secured threaded stem, or adjusting carried by the side member2.

screw, C; D, abelt-like grinding element carried The bearing member 9amay be adjusted to- 45 by an upper roller D and a lower roller D2jourwards the crank-shaft by means of an adjusting naled in the innerframe C; E, a handle xedly rod l2 whose upper end has threadedconnection secured to and depending from the lower end of.A with a lug-I2a carried by the side member 3. the main frame A; and F, aninternally threaded The lower end of the rod I2 extends through a sleeve(or nut) connected with the threaded stem bearingmlzuig/LZb/wthwxilczhthe side-member 3 50 C' and having a" head portion F' journaled in theof the n frame is pr ided at its lower end. lower end of the handle E,from which depends The lower extremity of the adjusting rod I2 is` areduced extension F2 on which is rigidly seequipped with a knurled headI2c which is discured a graduated actuating knob F3. n posed a shortdistance below the end-member IIl The nut F and the attendant partsserve as a of the main frame. 55

lI'he bearings 6, 1a and 8 with which the main frame is equipped afforda three-point bearing of the main frame against the crank-shaft.

The inner frame C is shown as comprising an angle-form base-member I3which affords an end-member I3n and a longitudinal member I3b.

The longitudinal member I3b has sliding dove.

l in the tubular member I1, the member I8 being is secured to a head.'or block, I9 in which the yupper roller D is journaled, the parts beingconnected by small bolts 20, as shown in Fig. 3; a spring 2|, confinedbetween the lower end of the tubular plunger I8 and the member I4; and aclamping screw 22 by means of which the members I1 and I8 may be rigidlyconnected together at will.

'Ihe spring 2| may serve to give desired tension to the belt-likegrinding element D, after which the clamping screw 22 may be tightenedif desired. It may be stated that the upper portion of the tubularmember I1 isprovided with a longitudinal slot, as indicated at I1, theclamping screw 22 extending across this slot.

'The tubular member I1 may be provided with a transverse perforation,indicated at 23; and the tubular member I8 may be provided at a somewhathigher point with a perforation 2|. When desired, the set screw 22 maybe loosened, the plunger I8 may be depressed to slacken the belt, and apin (not shown) may be inserted through the perforation 24 into theperforation 23, when these perforations are in registration. This may bedone when it is desired to remove the belt D. To permit such removal,the lower portion of the inner frame may be provided with a slot 25(Figs. 1 and 3) in which is removably secured a fillet 25 which is heldin place by the cap-screws I5. l

The lower roller D2 is journaled in the lower portion of the inner frameC. It is provided with a shaft 26 journaled in bearings 21 with whichthe inner frame is provided. These bearings may be ball-bearings ifdesired. 'I'he shaft 26 extends transversely of the frame; and, as willbe understood from Figs. 1 and 5, the shaft is connected with a flexibleshaft 28 which may be driven by means of an electric motor (not shown).In practice, the electric motor may be direct-coupled to the shaft 26,so that the 'roller D2 which drives the belt D may be actuated at highspeed. A speed of .two or three thousand revolutions a minute issuitable.

The lower roller D2 preferably is crowned very slightly at 29. The upperroller D' should be a true cylinder, however. It may be provided withtransverse grooves 30 which permit some air circulation and tend to havea cooling effect.

From the description given, the operation will be readily understood.When the crank of aL crank-shaft requires grinding, the connecting rodsfrom the pistons may be removed, after flrst .frame of the grindingimplement, the implement may be hooked over a crank of the crank-shaft.The bearings 1B and 98L with which the main frame of the implement isequipped may be suit, ably adjusted with relation to the bearing member6 to properly center the upper portion of the main framev upon thecrank, it being understood that the frame-member 3 is re-applied afterthe implement has been hung upon the crank. By means of the micrometeradjustment indicatedat F-F3, the grinding element D may be adjusted tomake suitable contact with the crank of the crank-shaft B. The enginemay be turned at a slow speed. The grinding element may be operated athigh speed by means of an electric motor, or other source of power. Itwould be possible, of course, to gear the grinding element of theimproved implement to the engine of the automobile, if desired.

The range of adjustability of ,the bearing members 1a and 9 issuilicient to enable the implement to be adjusted to the usual range ofshafts employed in connection with automobile enrgines.

The outer surface of themember Ib of the main frame preferably is bowedslightly. That is, the outer surface is slightly convex in alongitudinal direction, as indicated at 3| in Fig. 3. One of the screws2 is located above the point where the member 2 bears against the convexsurface,

4and the other screw 2a is located below that point.

Accordingly, the screws may be used as a means for truing up or givingproper symmetry to the frame, depending upon the extent to which thescrews are turned inwardly, respectively.

The upper roller D is shown provided with a roller bearing. This isdesirable because of the high speed at which the grinding element isoperated. The endless belt I which 'forms the grinding element D mayhave its outer surface coated with fine carborundum or the like. It ispossible, of course, to use grinding-belts having different abrasiveeffects. For example, a belt of rather high abrasive effect may beemployed in the first portion of the grinding operation, and then a beltwith an extremely ne grinding surface may be employed for finishingpurposes.

.The improved implement enables the ordinary work of grinding theconnecting-rod bearings of an automobile engine crank-shaft to beeffected expeditiously and at relatively small expense.

The bearings may be toned up accurately by means of the improvedimplement without removing the crank-shaft.

'Ihe frame-member 2 is a strong, substantial frame-member and is securedvery strongly to the base-member I of the frame. By reason of the convexsurface indicated at 3I andthe connecting-screws 2B, the desired degreeof verticality of the member 2 may be firmly established. The

opposite side member 3 is shown of thinner metal and its position isregulated by the member 2. In this manner, the desired symmetry of theframe is attained; and the inner. frame C, by reason of the substantialsliding connection which it has with the member Id, assures a truecontact between the grinding belt and the crankshaft. It has been foundthat by very slightly crowning the roller D, the belt will stay on therollers without diiilculty. The upper roller should present a truegenerally cylindrical surface, in order that the grinding belt may haveline contact with the shaft Swhich is being ground.

The foregoing detailed description has been given for clearness -ofunderstanding only, and j no unnecessary limitations should beunderstood therefrom, but the appended claims should be construed asbroadly as permissible in view of the prior art.

What I regard as new and desire to secure by Letters Patent is:

1. A grinding implement of the character set forth, comprising anelongated frame equipped at its upper end with a crank-shaft bearing; aflexible endless belt of abrasive material mounted on a rollerjournalled in said frame; means for driving said belt; and means foradjusting said belt towards and away from the crank-shaft.

2. A grinding' implement as specified in claim l, in which said belt ismounted upon a pair of rollers journalled in a longitudinally adjustableinner frame mounted in the main frame.

3. A grinding implement as specified in claim 1, in which said belt ismounted upon a pair of rollers journalled in a longitudinally adjustableinner frame mounted in the main frame, said inner frame being equippedwith a rigidly secured threaded stem and said outer frame being equippedwith a micrometer adjustment acting through the medium of said threadedstem.

4. A grinding implement of the character set forth, comprising a mainframe equipped internally at its upper portion with a bearing adapted toengage the upper surface of a crank and having its sides equipped withadjustable bearings adapted to engage the lower portion of the crank; anendless belt grinding element, of substantially the same width as saidframe, adjustably mounted on rollers journalled in said frame; and meansfor driving said grinding element.

5. A grinding implement as specified in claim 4, having the lower end ofthe main frame equipped with a depending handle.

6. A grinding implement as speciiied in claim 4, in which the lower endof the main frame is equipped with a depending tubular handle and inwhich the grinding element is carried by an inner frame having anadjusting stem housed in said handle.

7. A grinding implement of the character set forth, comprising: a mainframe comprising detachably related side-members having an interlockconnection at their upper ends; a lower frame-member interposed betweenand secured to the lower portion of said side-members; an inner frameadjustable longitudinally within said main frame; an endless-beltgrinding-element carried by rollers journalled in said inner frame; andmeans for actuating the lower roller and thereby actuating thegrinding-element.

8. A grinding implement'of the character set forth, comprising: an outerframe comprising detachably related elongated frame-members; bearingsmounted in the upper portion of said frame and adapted to engage a crankfrom which the main frame lmay be suspended: an inner frame adjustablelongitudinally of the main frame; rollers mounted in the upper and lowerend-portions of the inner frame; a grinding-belt mounted on saidrollers; and means for actuating the lower roller.

9. A grinding implement as specified in claim 8, in which the main frameis equipped with an adjusting rod for one of the bearings which engagesthe crank, said adjusting rod extending through the lower end of themain frame.

10. A grinding implement as specified in claim 8, having the lower endof the main frame equipped with a tubular handle and having the innerframe equipped with an adjusting stem extending axially into saidhandle; and a nut mounted in the lower portion of said handle andengaging said adjusting stem, said nut having actuating means disposedbelow the lower end of said handle.

11. A grinding implement comprising an outer frame composed ofdetachably connected elongated members; bearings for a crank-shaft inthe upper portion of said frame; an inner adjustable frame disposedbelow the space for the crank-shaft; an endless-belt grinding elementmounted in said inner frame; and means for actuating said grindingelement. l

12. A grinding element comprising a main frame consisting of detachablyrelated members; bearings in the upper portion of said frame adapted toengage a crank; a handle connected with the lower end of said frame; aninner frame comprising collapsibly related upper and lower members;rollers journalled in said upper and lower members; a grinding beltmounted on said rollers; means for actuating the lower roller; and meansfor adjusting the inner frame longitudinally of the main frame.

13. In an implement of the character set forth: a main frame ofelongated form comprising detachably connected members, said frame beingequipped'internally at its upper end with bearings for engaging acrank-shaft; an inner frame provided with rollers adjustably connectedwith the outer frame; an endless grinding belt mounted on said rollersand adapted to-engage the crank-shaft when properly adjusted; and meansfor actuating said grinding element relative to the main frame.

14. In an implement of the character set forth: a main frame ofelongated form comprising detachably connected members, said frame beingequipped internally at its upper end with bearings for engaging acrank-shaft; a longitudinally collapsible inner frame adjustablyconnected with the outer frame and provided with supporting rollers; anendless grinding belt mounted on said rollers and adapted to engage thecrankshaft when properly adjusted; and means for main frame.

JOSEPH HRIBAR.

